A semi-opaque ribbon is observed in the main window:
Tab switching does not remove it. Window moving does not remove it. It vanishes after window resizing.
To reproduce
Run with -regtest, generate some blocks (200 in my case), then quit.
Remove rev00000.dat file to trigger an error.
Run with -regtest and in the dialog "Do you want to rebuild the block database now?" click "OK".
System information Linux Mint 19.3 + Cinnamon 4.4.8
Both versions affected:
- 0.19.0.1 (gitian)
- master + system Qt 5.9.7
